how use memorycache in this method?

private readonly IMemoryCache _memoryCache;

public Constructor (IMemoryCache memoryCache)
{
    _memoryCache = memoryCache;
}

public IActionResult Index(int pageId = 1, string filter = "",
       int startPrice = 0, int endPrice = 0, string getType = "", string orderByType = "date",
         List<int> selectedGroups = null, List<int> selectedBrand = null, List<int> selectedTags = null
        , List<int> selectedsize = null , string Discount = "")
    {

        ViewBag.selectedGroups = selectedGroups;
        ViewBag.selectedTags = selectedTags;
        ViewBag.selectedsize = selectedsize;
        ViewBag.Discount = Discount;
        ViewBag.getType = getType;
        
        var groups = new List<Group>();
        if (_memoryCache.TryGetValue("groups", out groups)
        {
            ViewBag.Groups = groups;
        }
        else 
        {
            groups = _productService.GetAllGroup(); 
            _memoryCache.Set("groups", groups);
            ViewBag.Groups = groups;    
        }
        
        var tags = new List<Tag>();
        if (_memoryCache.TryGetValue("tags", out tags)
        {
            ViewBag.Tags = tags;
        }
        else 
        {
            tags = _productService.GetTags().Where(c => c.ActiveRow).ToList();
            _memoryCache.Set("tags", tags);
            ViewBag.Tags = tags;
        }

        var sizes = new List<Size>();
        if (_memoryCache.TryGetValue("sizes", out sizes)
        {
            ViewBag.size = sizes;
        }
        else 
        {
            sizes = _productService.GetSizes().ToList();
            _memoryCache.Set("sizes", sizes);
            ViewBag.size = sizes;
        }           
        

        var pageId = null;
        if (_memoryCache.TryGetValue("pageId", out pageId))
        {
            ViewBag.pageId = pageId;
        }
        else 
        {
            _memoryCache.Set("pageId", pageId);
            ViewBag.pageId = pageId;
        }
                    
        return View(_productService.GetProducttype(pageId, filter, startPrice, endPrice, getType, orderByType, selectedGroups, selectedBrand, 24, selectedTags, selectedsize, Discount));
    }